.header {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 2;
    width: 100%;
    min-width: 1200px;
    height: 60px;
    padding: 8px  15px 0 15px ;
    background-color: #fff;
    box-shadow: 0 0 3px #ddd;
    box-sizing: border-box;
}